Dragonfly

From Zelda Wiki.org

Dragonfly
Game(s)	Majora's Mask
Habitat(s)	Southern Swamp Stone Tower Temple
Effective Weapons	Sword Deku Flower Bubble

Colossal Dragonflies will electrocute you and send you flying to the floor if you are floating as a Deku Scrub. Simply slash them with your sword or shoot up underneath them out of a flower to kill them. To avoid being electrocuted though Deku Link's shield works best. They reside in the Southern Swamp and also make an appearance in the Stone Tower Temple.